/*
* Copyright 2010-2020 Redgate Software Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.flywaydb.core.internal.parser;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
public class PositionTrackingReader extends FilterReader {
private final PositionTracker tracker;
private boolean paused;
PositionTrackingReader(PositionTracker tracker, Reader in) {
super(in);
this.tracker = tracker;
}
@Override
public int read() throws IOException {
int read = super.read();
if (read != -1 && !paused) {
tracker.nextPos();
char c = (char) read;
if (c == '\n') {
tracker.linefeed();
} else if (c == '\r') {
tracker.carriageReturn();
} else {
tracker.nextCol();
}
}
return read;
}
@Override
public void mark(int readAheadLimit) throws IOException {
paused = true;
super.mark(readAheadLimit);
}
@Override
public void reset() throws IOException {
super.reset();
paused = false;
}
}